FIX: "COM Object Can Not Be Used" Error Message When You Use an STA COM Object That You Created by Using Server.CreateObject and Stored in Session Scope in a Different Web Page

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Article ID: 818612 - View products that this article applies to.
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SYMPTOMS

You create a single-threaded apartment (STA) COM object by using Server.CreateObject, and then you store this STA COM object in session scope. If you use this STA COM object from another Web page, you receive the following error message:
COM object that has been separated from its underlying RCW can not be used

RESOLUTION

Important To apply this hotfix, you must have the .NET Framework Service Pack 2 installed.

How to obtain the hotfix

This issue is fixed in the June 2003 ASP.NET Hotfix Package 1.1. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
821156 INFO: ASP.NET 1.1 June 2003 Hotfix Rollup Package
You cannot obtain this fix individually. You must install the rollup.

Note When you request this hotfix, you receive the rollup.

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version       Size       File name
   --------------------------------------------------------------
   25-Apr-2003  03:19  1.0.3705.424    196,608  Aspnet_isapi.dll
   25-Apr-2003  03:19                  510,714  Aspnet_perf2.ini
   25-Apr-2003  03:15                    4,169  Aspnet_perf.h
   25-Apr-2003  03:19                  513,302  Aspnet_perf.ini
   25-Apr-2003  03:19  1.0.3705.424     24,576  Aspnet_regiis.exe
   25-Apr-2003  03:19  1.0.3705.424     28,672  Aspnet_wp.exe
   24-Apr-2003  15:49  1.0.3705.424     69,632  Corperfmonext.dll
   24-Apr-2003  15:47  1.0.3705.424    303,104  Mscorjit.dll
   25-Apr-2003  12:55  1.0.3705.424  1,953,792  Mscorlib.dll
   24-Apr-2003  15:48  1.0.3705.424  2,269,184  Mscorsvr.dll
   01-Aug-2002  18:38                       15  Smartnav.htm
   17-Oct-2002  14:55                    8,728  Smartnav.js
   24-Apr-2003  15:40                   10,284  Mscorlib.ldo
   24-Apr-2003  15:48  1.0.3705.424  2,269,184  Mscorwks.dll
   25-Apr-2003  12:59  1.0.3705.424  1,191,936  System.web.dll

This hotfix is also available for the German version of the Microsoft .NET Framework 1.0. This hotfix is also available for the French version of the Microsoft .NET Framework 1.0.

If you applied the hotfix in this article for Microsoft ASP.NET included with the .NET Framework 1.0, and if you upgraded to Microsoft ASP.NET included with the .NET Framework 1.1, apply the hotfix package from the following Microsoft Knowledge Base article:
821156 INFO: ASP.NET 1.1 June 2003 Hotfix Rollup Package
Additionally, if you upgraded to the .NET Framework 1.1, and if you experience the symptoms in this article, apply the hotfix package from this Microsoft Knowledge Base article.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

If you create an STA object by using Server.CreateObject (Attribute AspCompat ="true"), you can use the object only in the Web page that you created it for. If you store the object in session scope, and then you try to gain access to it from a different Web page, you receive the error message.

Additionally, if you implement the OnStartPage method and the OnEndPage method from your STA COM object, these methods are not called on your object in the second Web page.

Steps to reproduce the behavior

  1. Use the following sample code to create a Microsoft Visual Basic 6.0 COM object that has AspEventProblem.Class1 for the ProgId:
    Public Function Test() As String
           Test = "Hello from COM Object"
    End Function
  2. Use Microsoft Visual Basic .NET to create a new Web application.
  3. Create a Web Form named WebForm1.aspx.
  4. Add a Button object to WebForm1.aspx that contains the following sample code:
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As 	System.EventArgs) Handles MyBase.Load 
          Session("mycomp") =Server.CreateObject("AspEventProblem.Class1") 
    End Sub Private Sub
    Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
          Handles Button1.Click Response.Redirect("webform2.aspx") 
    End Sub 
  5. Create a Web Form named WebForm2.aspx that contains the following sample code:
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            Label1.Text = Session("mycomp").Test()
    End Sub
  6. In your browser, view WebForm1, and then click Button1.
  7. When WebForm2 appears, click Button1.

Properties

Article ID: 818612 - Last Review: October 25, 2005 - Revision: 5.2
APPLIES TO
  • Microsoft .NET Framework 1.0
Keywords: 
kbbug kbfix kbqfe kbnetframe100presp3fix kbhotfixserver KB818612

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